Ismael Marin

Software Engineer & Tech Lead · Backend Systems and AI Tooling

León, Guanajuato, Mexico (Remote)

Email: [email protected]

Phone: +52 477 792 9000

Website: ismaelmarin.dev

PDF: Download résumé

LinkedIn: in/ismaelmarin

GitHub: github.com/igmarin

Summary

Software engineer and technical leader who builds backend systems, SaaS products, integrations, and developer tools. Ruby on Rails is my deepest production experience. I also work with Rust, Elixir/Phoenix, and Python, particularly on AI systems. I have worked remotely throughout my career and stay hands-on with architecture and implementation. Open to full-time, part-time, and contract work.

Skills

Backend & Infrastructure

Ruby on Rails, Rust, Elixir/Phoenix, Python, Hanami, PostgreSQL, Redis, Docker, AWS, backend architecture, and API design.

AI & developer tools

Model Context Protocol (MCP), Rails context and introspection tools, agent evaluation, LLM integration, and developer tooling.

Leadership & delivery

Technical leadership, Architecture Decision Records (ADRs), mentoring, product planning, TDD, and cross-functional delivery.

Experience

Head of Strategy / Technical Advisor · Nebula Ideas
2010 — Present
  • Advise startups and product teams on architecture, backend modernization, AI adoption, technical strategy, and product development while remaining hands-on with implementation.
  • Build and modernize Ruby on Rails products, infrastructure, APIs, and e-commerce systems; help founders set MVP scope and technical priorities.
  • Develop AI engineering and developer tools across Ruby, Rust, Elixir, and Python.
Software Engineer → Senior Software Engineer → Tech Lead · Dealerware
May 2022 — April 2026
  • Worked on distributed systems processing approximately 10,000 telematics events per minute and integrations supporting vehicle lifecycle and daily operations.
  • Architected Auth0-based enterprise identity and SSO integrations, plus role-aware analytics integrations with Databricks and ThoughtSpot.
  • Led a zero-downtime Elasticsearch-to-OpenSearch migration that reduced infrastructure cost while preserving production availability.
  • Authored 40+ ADRs/RFCs and contributed 370+ merged pull requests across 20+ production repositories.

Featured Open Source Work

rails-ai-bridge GitHub

Ruby · Generates project context for AI coding assistants and offers read-only Rails introspection through MCP. More than 10,000 total RubyGems downloads as of 2026-09-25 UTC.

ruby-skill-bench GitHub

Ruby · Compares agent runs with and without added context in isolated Git workspaces, then uses blind judging to assess the difference. More than 3,000 total RubyGems downloads as of 2026-09-25 UTC.

brigid GitHub

Rust CLI that turns codebases into guided tutorials.

rs-guard GitHub

I contribute to this Rust CLI for multi-provider AI code review in GitHub pull requests and local workflows.

rust-core-skills GitHub

Rust agent skills covering ownership, type-driven design, error handling, project context, and Cargo testing.

pi-vida GitHub

Launcher for language-specific coding-agent setups, combining skills, a safety gate, and ticket tracking across Pi and other supported hosts.

agent-mcp-runtime GitHub

Rust CLI for managing MCP connections and LLM tool-calling loops.

elixir-phoenix-skills GitHub

Guidance for AI coding assistants working with Phoenix, LiveView, and Ecto.

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